Date of Award

Spring 1-1-2020

Degree Type

Thesis

Degree Name

Master of Science Degree

Department

Mechanical Engineering

First Advisor

Rashidi, Majid

Second Advisor

Dr. Tushar Borkar

Third Advisor

Dr. Asuquo B. Ebiana

Abstract

This study examines a potential compressor package to determine whether a permanent magnet eddy current damper could feasibly address compressor crankshaft torsional vibration concerns. This is done by modeling the forced response over a range of operating speeds using lumped stiffness and inertia values, compressor torque curves, and varying approximated damper properties. The predicted forced response for the 23 degree of freedom system is found by resolving the equations of motion using MATLAB’s fourth-fifth order Runge-Kutta variable time step routine. Damper dimensions are estimated based on available space inside the compressor crankcase. Damper properties are approximated assuming a conducting disc connected to the crankshaft surrounded by two freely rotating annulus magnetic arrays. Solutions obtained indicate that for this compressor package a PMEC damper has the potential to reduce compressor crankshaft vibrations with the effectiveness primarily depending on the strength of the magnetic field and the area of the conducting disc that interacts with the magnetic field.

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